将字符串 按照规定编码方式编码

1、ASCII 码

byte[] postBytes = Encoding.ASCII.GetBytes(param);

2、UTF-8 编码

StreamReader reader = new StreamReader(receiveStream, Encoding.UTF8);

3、GB2312编码

Encoding myEncoding = Encoding.GetEncoding("gb2312");

StreamReader reader = new StreamReader(receiveStream, myEncoding);

StreamReader reader = new StreamReader(receiveStream, Encoding.Default);

StreamReader reader = new StreamReader(receiveStream, Encoding.UTF8);